A source emitting a sinusoidal sound wave of frequency 360

Last updated: 7/10/2022

A source emitting a sinusoidal sound wave of frequency 360 Hz travels towards a wall at a speed 30 m/s. What is the beat frequency perceived by an observer moving at speed 10 m/s, speed of sound in air is 330 m/s ? A. 64Hz if observer is going away from the source and wall. B. 68 Hz if observer is going towards the source and the wall C. 60 Hz if observer is in between the wall and the source and moving away from the wall. D. 24 Hz if observer is in between the wall and the source, and moving towards the wall.